<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<style type="text/css">
	#navi li{ /* 하위 선택자 : #navi에 속한 li를 선택*/
	border : 1px solid red;
	}
	ul>li{	/* 자식 선택자 : ul의 직속인 li를 선택*/
	color:green;		
	}
	
</style>
<body>
<div id="navi">
<ul>
<li>홈</li>
<li>제품소개</li>
<li>고객센터</li>
</ul>
</div>
<ul>
<li>홈</li>
<li>제품소개</li>
<li>고객센터</li>
</ul>

</body>
</html>